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  #1  
Old 02-22-2011, 06:06 PM
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New primer still leaks on 300SD

Just replaced the older style white hand fuel primer on my 84 300SD.
Followed a great tutorial on site here (thanks).
still find today that fuel is gathering at base of new pump. Made sure i installed the copper gasket washer that came with the Bosch unit. Tightened it till as far as was thought safe. Pic not the best but see attached.
When I removed the threaded nipple for the secondary fuel line filter (the clear one) saw that it had no washer. Does it require one and could this be the culprit ?
Anyone know what size it is to save me oulling it again to check if thats the case ?
thank you

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New primer still leaks on 300SD-fuel-primer-leak.jpg  
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  #2  
Old 02-23-2011, 11:04 AM
toomany MBZ's Avatar
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Make sure just where leak is. Clean all threads throughly.

No, there is not any seal ring there, same connection as your brake lines to the M/C.
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New primer still leaks on 300SD-img_4809.jpg   New primer still leaks on 300SD-screen-shot-2011-02-23-11.01.01-am.jpg  
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Old 02-23-2011, 01:26 PM
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If it turns out that the leak is coming from the union that is screwed into the fuel pump - rather than the pipe onto the union - have a look here. There may be some pictures that help you (although it isn't the pump on your car as far as I know).

Refreshing the fuel pump on an OM617 (European spec non turbo)

The rubber O rings under the union have an outside diameter of 22mm on this pump.
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Don't leave that there - I'll take it to bits!
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Old 02-23-2011, 11:22 PM
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thank you both so much.
As usual very informed and just the answers ands pics I was seeking.
I'm doing the dreaded oil cooler line and filter housing gasket job this coming week so I'll check then and get back.
thanks again for your time
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Old 02-24-2011, 03:47 AM
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Hey topshelf,

If you are about to do oil cooler lines on an OM617 perhaps you'd be willing to consider this alternative method of getting them out?

I think it is an easy job - everyone else says no it is a pain in the arse...

I think by removing an oil cooler bracket from the engine as well as the oil cooler lines you can get enough space to pull them out. You can make more space by removing the radiator too.

Check out this thread:-

W123 300D Oil cooler lines

I'd be interested to hear of your experiences - prove me right or prove me wrong - no hard feelings! I just wanna know if my hunch is right or not.
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1992 W201 190E 1.8 171,000 km - Daily driver
1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone
1965 Land Rover Series 2a Station Wagon CIS recovery therapy!
1961 Volvo PV544 Bare metal rat rod-ish thing

I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior



Don't leave that there - I'll take it to bits!
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Old 02-24-2011, 07:50 AM
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^ Agreed, let us know what you eventually do.

Be sure to support (put a wrench on) the oil cooler itself when you go to loosen the lines there.
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Old 02-24-2011, 11:47 AM
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Quote:
Originally Posted by toomany MBZ View Post
Make sure just where leak is. Clean all threads throughly.

No, there is not any seal ring there, same connection as your brake lines to the M/C.
Similar connection but not the same. It's a flare fitting technically. The seal is metal to metal of the "ball and socket". The flare nut does not provide a seal, just the clamping force. The primer pump flare fitting resembles the injector hardline fitting more than the brake line fittings.

Wipe dry the area with tissue paper, then wrap each fitting of the primer pump tightly with tissue paper and start the engine. It will be apparent shortly where the source of the leak is.
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Old 02-24-2011, 03:24 PM
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Thanks and sorry, I didn't mean to confuse anyone.

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